87-2x=4x-21

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Solution for 87-2x=4x-21 equation:


Simplifying
87 + -2x = 4x + -21

Reorder the terms:
87 + -2x = -21 + 4x

Solving
87 + -2x = -21 + 4x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4x' to each side of the equation.
87 + -2x + -4x = -21 + 4x + -4x

Combine like terms: -2x + -4x = -6x
87 + -6x = -21 + 4x + -4x

Combine like terms: 4x + -4x = 0
87 + -6x = -21 + 0
87 + -6x = -21

Add '-87' to each side of the equation.
87 + -87 + -6x = -21 + -87

Combine like terms: 87 + -87 = 0
0 + -6x = -21 + -87
-6x = -21 + -87

Combine like terms: -21 + -87 = -108
-6x = -108

Divide each side by '-6'.
x = 18

Simplifying
x = 18

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